At midnight Sunday, 50,000 balloons will drop from the top of the Hyatt Regency Houston's 33-story atrium. The New Year's spectacle in downtown Houston — now in its 40th year — is an annual tradition for those who can afford the party's $150 ticket.

Norma Hernandez and her family have never been, though she imagines it's a beautiful sight.

"We just fill them up," Norma said in Spanish on Saturday morning, raising her voice to be heard over the hum of four air compressors.

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Norma, 55, ripped open a new bag of balloons, pulled one out, slipped it over an air nozzle and watched it inflate. A second later, she tied it off, tossed it over the edge and onto netting stretched across the atrium's top level, then quickly grabbed another.

"She's the fastest of all of us," said Maria Hernandez, Norma's 38-year-old daughter. "She can do six or seven a minute."

That's about 390 balloons an hour, 3,120 balloons per day — and somewhere in the neighborhood of 143,000 balloons since she and her family started doing this 23 years ago, when her husband, a roofer, volunteered his family for the assignment with Funtastic Balloons to make some extra money around the holidays.

"It's a slow time of year for roofing," Jose Hernandez said. "This has become a family tradition."

They've gotten better at the task over the years. It used to take them three days. Now their 12-person crew — nearly all of them relatives or friends — can get the job done in under two. The inflaters have a wide range of day jobs, none of them balloon-related: A mortgage broker, a preschool teacher, a chemical plant laborer, a stay-at-home mom.

They all wrap their fingers with tape, a strategy Norma developed that first year after her fingers started to blister.

New Year's at Hyatt Regency Houston

When: 7 p.m. to 1 a.m. Dec. 31

Location: 1200 Louisiana

Cost: Overnight packages start at $349 for two people.

More details: http://houston.regency.hyatt.com

"Your fingers will be raw after only 30 balloons," Jose said. "You've got to protect them."

The hotel reserves a pair of hotel rooms for the family each year, but the Hernandezes have never stayed for the big celebration, which is expected to attract 2,000 people. Instead they always host their own party at home, where dozens of family members eat tamales and play games before counting down the end of another year.

Norma tied off another balloon and tossed it over the edge. It must have caught in a stream of air from a heat vent, causing it to drift left and miss the netting.

The lone red balloon fell slowly toward the floor, 30 stories down.

"It's kind of pretty," one of the Hernandezes said. "Imagine all of them at once."